401
Array
(
    [0] => HTTP/1.1 401 Unauthorized
    [1] => Server: nginx
    [2] => Date: Wed, 19 Mar 2025 09:00:50 GMT
    [3] => Content-Type: application/json
    [4] => Content-Length: 116
    [5] => Connection: keep-alive
    [6] => Access-Control-Allow-Origin: https://sendgrid.api-docs.io
    [7] => Access-Control-Allow-Methods: POST
    [8] => Access-Control-Allow-Headers: Authorization, Content-Type, On-behalf-of, x-sg-elas-acl
    [9] => Access-Control-Max-Age: 600
    [10] => X-No-CORS-Reason: https://sendgrid.com/docs/Classroom/Basics/API/cors.html
    [11] => Strict-Transport-Security: max-age=31536000; includeSubDomains
    [12] => Content-Security-Policy: frame-ancestors 'none'
    [13] => Cache-Control: no-cache
    [14] => X-Content-Type-Options: no-sniff
    [15] => Referrer-Policy: strict-origin-when-cross-origin
    [16] => 
    [17] => 
)
{"errors":[{"message":"The provided authorization grant is invalid, expired, or revoked","field":null,"help":null}]}